From: Steve Wise <sw...@opengridcomputing.com>
Some HW platforms can reorder read operations, so we must rmb() after
we see a valid gen bit in a CQE but before we read any other fields from
the CQE.
Signed-off-by: Steve Wise <sw...@opengridcomputing.com>
---
drivers/infiniband/hw/cxgb4/t4.h | 2 ++
1 file changed, 2 insertions(+)
diff --git a/drivers/infiniband/hw/cxgb4/t4.h b/drivers/infiniband/hw/cxgb4/t4.h
index e73ace7..62017a7 100644
--- a/drivers/infiniband/hw/cxgb4/t4.h
+++ b/drivers/infiniband/hw/cxgb4/t4.h
@@ -566,6 +566,8 @@ static inline int t4_next_hw_cqe(struct t4_cq *cq, struct
t4_cqe **cqe)
printk(KERN_ERR MOD "cq overflow cqid %u\n", cq->cqid);
BUG_ON(1);
} else if (t4_valid_cqe(cq, &cq->queue[cq->cidx])) {
+ /* Ensure CQE is flushed to memory */
+ rmb();
*cqe = &cq->queue[cq->cidx];
ret = 0;
} else
--
1.8.4
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